Add FilePath to base namespace.

chrome/browser/platform_util.h

Index: chrome/browser/platform_util.h
diff --git a/chrome/browser/platform_util.h b/chrome/browser/platform_util.h
index 44fde5da77fa513dfacc706e832b90ca3ba3fa47..629d7566ce39665bee00e6b6476829cebc6ced93 100644
--- a/chrome/browser/platform_util.h
+++ b/chrome/browser/platform_util.h
@@ -10,18 +10,21 @@
 #include "base/string16.h"
 #include "ui/gfx/native_widget_types.h"
 
-class FilePath;
 class GURL;
 
+namespace base {
+class FilePath;
+}
+
 namespace platform_util {
 
 // Show the given file in a file manager. If possible, select the file.
 // Must be called from the UI thread.
-void ShowItemInFolder(const FilePath& full_path);
+void ShowItemInFolder(const base::FilePath& full_path);
 
 // Open the given file in the desktop's default manner.
 // Must be called from the UI thread.
-void OpenItem(const FilePath& full_path);
+void OpenItem(const base::FilePath& full_path);
 
 // Open the given external protocol URL in the desktop's default manner.
 // (For example, mailto: URLs in the default mail user agent.)